#include<iostream>
using namespace std;
void swap(int& x, int& y)
{
	int temp = 0;
	temp = x;
	x = y;
	y = temp;
}
void swap(int* x, int* y)
{
	int temp = *x;
	*x = *y;
	*y = temp;
}
int main()
{
	int a, b;
	cin >> a >> b;
	cout << "Before swap: x=" << a << ", y=" << b << endl;
	swap(a, b);
	cout << "After swap: x=" << a << ", y=" << b << endl;
	return 0;
}